Mouthpiece



FIG. 1 is a top-right perspective view of a mouthpiece showing our new design;

FIG. 2 is a top-right-back view thereof;

FIG. 3 is a bottom-left view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a right-side view thereof;

FIG. 7 is a left-side view thereof;

FIG. 8 is a top view thereof; and,

FIG. 9 is a bottom view thereof.

The broken lines in FIGS. 3 and 9 depict portions of the mouthpiece that form no part of the claimed design. 

CLAIM The ornamental design for a mouthpiece, as shown and described. 